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研究了由介质打孔方法组成的二维长方晶格光子晶体平板的成像特性.利用时域有限差分方法计算了由点光源发出的光经过光子晶体平板的电磁场空间分布,并与利用平面波展开方法计算得到的等频率曲线进行了对比分析,发现一个高质量的近场实像是由于自准直效应和负折射效应的共同作用形成的.对于不同频率的入射光,可以在光子晶体的两个相互垂直的方向上分别实现近场成像.
The imaging characteristics of a two-dimensional rectangular lattice photonic crystal plate composed of a dielectric perforation method are studied. The spatial distribution of the electromagnetic field emitted by the point light source through the photonic crystal plate is calculated by using the finite-difference time-domain method, Method was calculated by comparing the frequency curve was found and found that a high-quality near-field real image is due to the self-collimation and negative refractive effect formed by the interaction of different frequencies of incident light, photonic crystals can be two Near-field imaging is performed in mutually perpendicular directions.